What happens when high humidity levels are left unchecked in the cabin?

High humidity levels in the cabin can lead to potential respiratory issues for passengers and crew. When humidity is too high, it can create a damp environment that allows for the growth of mold, bacteria, and other allergens. This can exacerbate respiratory conditions such as asthma or allergies and can also lead to discomfort among passengers.

In addition, high humidity can affect the quality of the air being circulated in the cabin. Since the aircraft's environment is tightly controlled, excess moisture can interfere with filtration systems, making it harder to maintain clean air. Overall, managing humidity is crucial to ensuring the health and comfort of everyone on board.